Brand

KMC

Products from KMC that we track, with our own notes on each.

KMC products we track

E-Bike Chains

KMC Z7 Chain (6/7/8-Speed)

The KMC Z7 (formerly labeled Z51) is the standard replacement chain for 6-, 7- and 8-speed drivetrains, which covers most hub-motor e-bikes. It is an inexpensive chain that includes a reusable quick link, so installation needs only a chain breaker to size it. On an e-bike the chain carries only your pedaling load with a hub motor, so a basic chain like this lasts well; with a mid-drive you should step up to an e-bike-rated chain. Measure your old chain for length and replace the freewheel if the old chain was badly worn.

Best for: 7-speed hub-motor e-bikes · Budget drivetrain refreshes · Riders who want a quick-link install

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E-Bike Chains

KMC e8 E-Bike Chain (8-Speed)

KMC's e-series chains are built for the extra torque a mid-drive motor puts through the drivetrain, with thicker, stronger plates and pins than a standard chain of the same speed. The e8 is the 8-speed version and also works on most 7-speed systems with 7-speed cog spacing. If you have a Bafang BBS02, BBSHD or a production mid-drive bike (Bosch, Shimano STEPS, Bafang M-series) with an 8-speed cassette, this is the chain to buy when the old one measures worn. It will not make a hub-motor bike faster, but it will not hurt either.

Best for: Mid-drive e-bikes with 8-speed cassettes · BBS02/BBSHD conversions · Heavy riders who break standard chains

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